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Old 07-09-08, 05:28 PM   #1
Johnny Alien
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Converting a Mountain Bike

I got a decent (at least I believe so) mountain bike frame for a very low amount. My plan was to use the frame to covert the bike into a single speed commuter.

It is currently converted to a single speed but because of the vertical dropout the original owner used a chain tensioner. I would like to, if possible, remove that and go without it. In order to do so I will need to either found the magic gear or get the eno hub.

My questions start here though...the original fork is toast PLUS I don't want to have any suspension. Thusly I need to get a new fork. Does anyone have a recommendation for a decent but affordable hard fork for a mountain bike? Also is it possible to convert this to 700C tires and is that something I need to take care of when purchasing the fork.

I have attached a photo below. It is an older Specialized Stumpjumper. (I will probably end up re-painting it especially since I won't find a fork to match it)
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Old 07-09-08, 06:01 PM   #2
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Converting it to 700c road tires will completely mess up the geometry- it's certainly possible, but I wouldn't recommend it. As well, it'll give you too much toe overlap- an accident waiting to happen.
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Old 07-09-08, 06:08 PM   #3
Gordon P
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First you will have to find out the steering tube size 1”or 11/8”. The second is to determine the length of the suspension fork.
Do you want to go threaded or threadless?
Then select disk or V-brake.
I just bought a Salsa Cromoto for a project I am working on and it cost 100 clams.
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Old 07-09-08, 06:35 PM   #4
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The cost involved in the conversion will be more then the value of your bike and not give you any major benefits over riding the bike with narrow 26" tires. It looks like you probably have a 1 inch threaded headset.If you live near a bike shop or coop you may check with them to see if they have something kicking around.
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Old 07-09-08, 07:16 PM   #5
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Cool. That solves one issue.

So if I pull the old fork will that give me all the info I need? It also seemed like there were some good prices on Surly forks as well.
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Old 07-09-08, 09:29 PM   #6
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I just bought a Mosso aluminium rigid fork off Ebay for just over $40 landed at my door step. Check it out. With a short travel fork like you show it should be a good match.

If you go disc brake then you can go with 700c. Sorry to contradict you theextremist04 but on it's own swapping to 700c is very doable on a mountain bike if the brake issues can be solved. I'm riding one set up this way almost daily and it's just fine. Of course you need to swap BOTH wheels to maintain the geometry or at least not alter it by much.

Or if you can get the canti posts moved up the stays and re-brazed to fit where they need to be for 700c rims than go that way and get a 1 inch or 1 1/8 cyclocross fork and use V brakes. And if you're doing that you may as well have them pull and braze in some track dropouts at the same time. But this is really a job for someone that's used to working with bicycles since the parts need to be accurately positioned and held via a jig of some form.

Of course all these modifications cost money. The CHEAP route would be to just stick with 26 inch wheels and use something like Panaracer Pasela 26x1.25 tires and try to start a whole new look in the single speed/fixie world with smaller wheels. Sort of the bicycle equivalent of the Supermotard motorcycle look.

Do the cost number game first and really figure out if this is worth it. If you have to get a guy to light a torch then I suspect it's best to just pass on the project with this frame and get something more in line with what you're after. If you could do the work yourself then that would be a different story. But otherwise you want to find a frame guy or a very good welding shop in your area that understands the need for precision on this job. And that's gonna cost you some serious coin to do this level of work. Very likely more than the frame is worth. Othewise it'll be so much scrap metal in short order. For positioning and matching dropouts and canti posts "close enough" isn't unless the guy has very high standards and understands where it has to be perfect and where you can fudge things.

Last edited by BCRider; 07-09-08 at 09:32 PM.
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